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High-order harmonic generation from solid targets with 2 mJ pulses

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<mark>Journal publication date</mark>2010
<mark>Journal</mark>Optics Letters
Issue number19
Volume35
Number of pages3
Pages (from-to)3186-3188
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Harmonics up to the 18th order are generated from solid targets by focusing 2mJ2mJ, 50fs50fs pulses at 800nm800nm to a spot size of 1.7μm1.7μm (FWHM). To our knowledge, this is the first demonstration of high-harmonic generation with a very short focal length paraboloid (푓/1.4f/1.4) and kilohertz laser system. The harmonics have a low divergence (<4°<4°) compared to the driving beam and conversion efficiencies (>10−7>10−7 per harmonic) comparable to gas harmonics. No contrast enhancement techniques are employed, and the system is capable of operating at 500Hz500Hz.